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libpayload: Move ttb_buffer to a standalone section 

When cleaning the sensitive data in the memory, we will want to prevent
zero out the content of tbb_buffer. Move the ttb_buffer to a standalone
section will simplify the problem.

BUG=b:248610274
TEST=emerge-cherry libpayload
BRANCH=none

Change-Id: I610276cbe30552263d791860c15e5ad9a201c744
Signed-off-by: Yi Chou <yich@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79078
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Yi Chou 2023-11-17 19:58:11 +08:00 committed by Martin L Roth
parent f9b6f2d355
commit 1739c99efe
2 changed files with 4 additions and 1 deletions
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2
payloads/libpayload/arch/arm64/libpayload.ldscript
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@ -58,6 +58,8 @@ SECTIONS
_edata = .;
.bss : {
*(.ttb_buffer)
*(.sbss)
*(.sbss.*)
*(.bss)

3
payloads/libpayload/arch/arm64/mmu.c
View File

@ -41,7 +41,8 @@ static unsigned int max_tables;
static uint64_t *xlat_addr;
static int free_idx;
static uint8_t ttb_buffer[TTB_DEFAULT_SIZE] __attribute__((aligned(GRANULE_SIZE)));
static uint8_t ttb_buffer[TTB_DEFAULT_SIZE] __aligned(GRANULE_SIZE)
__attribute__((__section__(".ttb_buffer")));
static const char * const tag_to_string[] = {
[TYPE_NORMAL_MEM] = "normal",